Ball valve sealing device capable of preventing failure

Abstract

The utility model relates to the technical field of valves, in particular to a ball valve sealing device capable of preventing failure. The ball valve sealing device comprises a valve body (1), and further comprises at least one group of sealing seats (5) which are arranged in a valve cavity (10) along the axial direction of a flow channel (9); the sealing seat (5) is located on one side of the ball body (4) and movably connected into the valve cavity (10) in the radial direction of the flow channel (9). A spring (6) is arranged between one end, far away from the ball body (4), of the sealing seat (5) and the valve body (1); and an annular packing ring (7) is arranged between the sealing seat (5) and the valve body (1) and close to the side of the flow channel (9). The utility model has the advantages that the structure is simple; the sealing reliability is high; safety and effectiveness; the valve is small in flushing and low in fault.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a ball valve sealing device capable of preventing failure. Background Art

[0002] A ball valve typically uses a sphere with a circular channel as its opening and closing element, which opens and closes as the valve stem rotates. The opening and closing element of a ball valve is a sphere with a through hole that rotates around an axis perpendicular to the channel, opening and closing the channel.

[0003] In the cold hydrogenation fluidized bed process of polysilicon production, hard-sealed ball valves are often used to implement process operation and control due to the high temperature and pressure of the production system, high requirements for medium properties and valve control. These valves require the valve ball to have high hardness, wear-resistant surface, and high operational reliability, and are expensive.

[0004] During use, silicon deposits are easily generated in the process pipelines and their accessories, causing the springs and spring seats between the valve sealing seat and the support to lose their elastic force due to the deposited silicon. The sealing pre-tightening force cannot be generated between the sealing seat and the sealing sphere, and the medium flow cannot be controlled. The process operation and control cannot be effectively realized, and the production system has major production safety risks. Utility Model Content

[0005] The purpose of the utility model is to overcome the defects of the prior art and provide a ball valve sealing device which has a simple structure, high sealing reliability, small valve scouring and low failure rate and prevents failure.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A ball valve sealing device for preventing failure includes a valve body 1, a flow channel 9 is provided in the valve body 1, a valve cavity 10 is provided in the valve body 1 and is connected to the flow channel 9, a ball 4 is connected to the valve cavity 10, the ball 4 is connected to the valve stem 2, and the valve stem 2 is rotatably connected to the valve body 1, and the valve stem 2 is connected to the valve body 1 by a gland 3; the ball valve sealing device also includes:

[0008] At least one set of sealing seats 5, the sealing seats 5 are arranged in the valve cavity 10 and along the axial direction of the flow channel 9; the sealing seats 5 are located on the side of the ball 4, and the sealing seats 5 are movably connected to the valve cavity 10 along the radial direction of the flow channel 9;

[0009] A spring 6 is provided between the end of the sealing seat 5 away from the ball 4 and the valve body 1 ; an annular packing ring 7 is provided between the sealing seat 5 and the valve body 1 on the side close to the flow channel 9 .

[0010] Furthermore, the spring 6 is embedded in the valve body 1 .

[0011] Furthermore, the annular filler ring 7 is made of polytetrafluoroethylene.

[0012] Furthermore, the annular filler ring 7 is made of polytetrafluoroethylene.

[0013] Furthermore, the device further comprises a sealing ring 8;

[0014] The sealing ring 8 is arranged between the sealing seat 5 and the valve body 1 at one end close to the ball 4.

[0015] Furthermore, the sealing ring 8 is an O-ring.

[0016] Furthermore, the material of the O-ring is polytetrafluoroethylene.

[0017] Furthermore, the sealing ring 8 is an annular corrugated sealing ring.

[0018] Furthermore, the sealing ring 8 is made of stainless steel or carbon steel.

[0019] The utility model provides a ball valve sealing device that prevents failure. An circumferential special-shaped packing seal and a sealing ring are arranged between the ball valve sealing seat and the valve body, which effectively prevents process gas or solid phase media from entering the sealing cavity and the spring seat from the circumferential direction, generating silicon deposition and causing failure of the sealing seat and spring, jamming of the ball valve, and other problems that make it impossible to carry out production process operations.

[0020] The material of the annular special-shaped filler is PTFE; the sealing ring can be an O-ring, the material of which is PTFE; the sealing ring can also be set as an annular corrugated sealing ring, the material of which is stainless steel or carbon steel.

[0021] The utility model provides a ball valve sealing device that prevents failure, which solves the structural design deficiencies of hard-sealed ball valves when used in special fields. The circumferential sealing form of the valve sealing seat and the supporting part effectively prevents volatile and corrosive gaseous or solid media from entering the seal and spring from the circumferential direction, thereby causing valve seal failure, and reduces the frequency of failures caused by valve scouring, wear and jamming, thereby saving production costs and reducing production safety risks.

[0022] Compared with the prior art, the utility model provides a ball valve sealing device that prevents failure, which has the following advantages:

[0023] (1)Simple structure.

[0024] (2) High sealing reliability.

[0025] (3) Safe and effective.

[0026] (4) Small valve erosion and low failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The utility model is a structural schematic diagram of a ball valve sealing device for preventing failure.

[0028] Figure 2 yes Figure 1 A magnified schematic diagram of the structure in the middle.

[0029] In the figure: 1 is the valve body, 2 is the valve stem, 3 is the gland, 4 is the ball, 5 is the sealing seat, 6 is the spring, 7 is the annular packing ring, 8 is the annular corrugated sealing ring, 9 is the flow channel, and 10 is the valve cavity. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solution of the present invention, the following examples further describe the present invention in detail. The following examples are only used to illustrate the present invention but are not used to limit the scope of the present invention.

[0031] A ball valve sealing device for preventing failure includes a valve body 1, a flow channel 9 is provided in the valve body 1, a valve cavity 10 is provided in the valve body 1 and is connected to the flow channel 9, a ball 4 is connected to the valve cavity 10, the ball 4 is connected to the valve stem 2, and the valve stem 2 is rotatably connected to the valve body 1, and the valve stem 2 is connected to the valve body 1 by a gland 3; the ball valve sealing device also includes:

[0032] At least one set of sealing seats 5, the sealing seats 5 are arranged in the valve cavity 10 and along the axial direction of the flow channel 9; the sealing seats 5 are located on the side of the ball 4, and the sealing seats 5 are movably connected to the valve cavity 10 along the radial direction of the flow channel 9;

[0033] A spring 6 is provided between the end of the sealing seat 5 away from the ball 4 and the valve body 1 ; an annular packing ring 7 is provided between the sealing seat 5 and the valve body 1 on the side close to the flow channel 9 .

[0034] Furthermore, the spring 6 is embedded in the valve body 1 .

[0035] Furthermore, the annular filler ring 7 is made of polytetrafluoroethylene.

[0036] Furthermore, the annular filler ring 7 is made of polytetrafluoroethylene.

[0037] Furthermore, the device further comprises a sealing ring 8;

[0038] The sealing ring 8 is arranged between the sealing seat 5 and the valve body 1 at one end close to the ball 4.

[0039] Furthermore, the sealing ring 8 is an O-ring.

[0040] Furthermore, the material of the O-ring is polytetrafluoroethylene.

[0041] Furthermore, the sealing ring 8 is an annular corrugated sealing ring.

[0042] Furthermore, the sealing ring 8 is made of stainless steel or carbon steel.

[0043] Example 1

[0044] A ball valve sealing device for preventing failure includes a valve body 1, a flow channel 9 disposed within the valve body 1, a valve cavity 10 communicating with the flow channel 9 disposed within the valve body 1, a ball 4 connected to the valve cavity 10, a valve stem 2 connected to the ball 4, and rotatably connected to the valve body 1. The valve stem 2 is connected to the valve body 1 via a gland 3. The ball valve sealing device also includes: at least one set of sealing seats 5 disposed within the valve cavity 10 and axially extending along the flow channel 9; the sealing seats 5 are located on the side of the ball 4 and are movably connected to the valve cavity 10 radially along the flow channel 9; a spring 6 is disposed between the end of the sealing seat 5 away from the ball 4 and the valve body 1; and an annular packing ring 7 is disposed between the sealing seat 5 and the valve body 1 on the side near the flow channel 9. The spring 6 is embedded in the valve body 1. The annular packing ring 7 is made of polytetrafluoroethylene.

[0045] Example 2

[0046] A ball valve sealing device for preventing failure includes a valve body 1, a flow channel 9 is provided in the valve body 1, a valve cavity 10 connected to the flow channel 9 is provided in the valve body 1, a ball 4 is connected to the valve cavity 10, the ball 4 is connected to the valve stem 2, and the valve stem 2 is rotatably connected to the valve body 1, and the valve stem 2 is connected to the valve body 1 by a pressure cover 3; the ball valve sealing device also includes: at least one group of sealing seats 5, the sealing seats 5 are provided in the valve cavity 10 and along the axial direction of the flow channel 9; the sealing seat 5 is located on the side of the ball 4, and the sealing seat 5 is movably connected to the valve cavity 10 along the radial direction of the flow channel 9; a spring 6 is provided between the end of the sealing seat 5 away from the ball 4 and the valve body 1; an annular packing ring 7 is provided between the sealing seat 5 and the valve body 1 near the flow channel 9.

[0047] The spring 6 is embedded in the valve body 1. The annular packing ring 7 is made of polytetrafluoroethylene. The device also includes a sealing ring 8, which is disposed between the sealing seat 5 and the valve body 1 at one end near the ball 4. The sealing ring 8 is an O-ring made of polytetrafluoroethylene.

[0048] Example 3

[0049] A ball valve sealing device for preventing failure includes a valve body 1, a flow channel 9 is provided in the valve body 1, a valve cavity 10 connected to the flow channel 9 is provided in the valve body 1, a ball 4 is connected to the valve cavity 10, the ball 4 is connected to the valve stem 2, and the valve stem 2 is rotatably connected to the valve body 1, and the valve stem 2 is connected to the valve body 1 by a pressure cover 3; the ball valve sealing device also includes: at least one group of sealing seats 5, the sealing seats 5 are provided in the valve cavity 10 and along the axial direction of the flow channel 9; the sealing seat 5 is located on the side of the ball 4, and the sealing seat 5 is movably connected to the valve cavity 10 along the radial direction of the flow channel 9; a spring 6 is provided between the end of the sealing seat 5 away from the ball 4 and the valve body 1; an annular packing ring 7 is provided between the sealing seat 5 and the valve body 1 near the flow channel 9.

[0050] The spring 6 is embedded in the valve body 1. The annular packing ring 7 is made of polytetrafluoroethylene. The device also includes a sealing ring 8, which is disposed between the sealing seat 5 and the valve body 1 at one end near the ball 4. The sealing ring 8 is an annular corrugated sealing ring and is made of stainless steel.

[0051] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the technical concept of the present invention, various changes can be made to the technical solution of the present invention. These simple variations all fall within the scope of protection of the present invention.

[0052] It should also be noted that the various specific technical features and steps described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0053] In addition, the various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A ball valve sealing device for preventing failure, comprising a valve body (1), a flow channel (9) being provided in the valve body (1), a valve cavity (10) being provided in the valve body (1) and communicating with the flow channel (9), a ball (4) being connected in the valve cavity (10), the ball (4) being connected to a valve stem (2), the valve stem (2) being rotatably connected to the valve body (1), and the valve stem (2) being connected to the valve body (1) by a gland (3); characterized in that: The ball valve sealing device further comprises: At least one set of sealing seats (5), the sealing seats (5) are arranged in the valve cavity (10) and along the axial direction of the flow channel (9); the sealing seats (5) are located on the side of the sphere (4), and the sealing seats (5) are movably connected to the valve cavity (10) along the radial direction of the flow channel (9); A spring (6) is provided between the end of the sealing seat (5) away from the sphere (4) and the valve body (1); and an annular packing ring (7) is provided between the sealing seat (5) and the valve body (1) on the side close to the flow channel (9).

2. A ball valve sealing device for preventing failure according to claim 1, characterized in that: The spring (6) is embedded in the valve body (1).

3. The ball valve sealing device for preventing failure according to claim 1, characterized in that: The annular filler ring (7) is made of polytetrafluoroethylene.

4. A ball valve sealing device for preventing failure according to claim 3, characterized in that: The annular filler ring (7) is made of polytetrafluoroethylene.

5. The ball valve sealing device for preventing failure according to claim 1, characterized in that: The device further comprises a sealing ring (8); The sealing ring (8) is arranged between the sealing seat (5) and the valve body (1) at one end close to the sphere (4).

6. The ball valve sealing device for preventing failure according to claim 5, characterized in that: The sealing ring (8) is an O-shaped sealing ring.

7. The ball valve sealing device for preventing failure according to claim 6, characterized in that: The material of the O-shaped sealing ring is polytetrafluoroethylene.

8. The ball valve sealing device for preventing failure according to claim 5, characterized in that: The sealing ring (8) is an annular corrugated sealing ring.

9. The ball valve sealing device for preventing failure according to claim 8, characterized in that: The sealing ring (8) is made of stainless steel or carbon steel.

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